KVarN: new KV-cache quant from Huawei. 3–5× KV cache compression with actual speed-up instead of slow-down, and unlike TurboQuant it holds up on reasoning (Apache 2.0, vLLM single flag)

The KV-cache quant race just got more interesting. Huawei just open-sourced KVarN, a KV-cache quantization method under Apache 2.0, drops into vLLM with one flag. Posting because the tradeoff it's claiming is genuinely d